Pure virtual functions

[makr28]

Every functions defined in the CTime CDate and CDateTime but I still get a C2259 error when i try to make a CDateTime object in main.

namespace MRDateTime
{
class Comparable
{
public:
virtual bool operator==(const Comparable &other)const = 0;

virtual bool operator!=(const Comparable &other)const = 0;

virtual bool operator<(const Comparable &other)const = 0;

virtual bool operator<=(const Comparable &other)const = 0;

virtual bool operator>(const Comparable &other)const = 0;

virtual bool operator>=(const Comparable &other)const = 0;

virtual void input(istream& sin) = 0;

virtual void print(ostream& sout) const = 0;

};
}
namespace MRDateTime
{
static const short HOURS_IN_DAY = 24;
static const short MIN_SEC = 60;

class CTime: virtual public Comparable
{
public:
CTime() {setCurrentTime();};
CTime(short hour, short minute = 0, short second = 0);

short getHour() const {return mHour;};
short getMinute() const {return mMinute;};
short getSecond() const {return mSecond;};

virtual bool operator==(const CTime &time) const;
virtual bool operator!=(const CTime &time) const;
virtual bool operator<(const CTime &time) const;
virtual bool operator<=(const CTime &time) const;
virtual bool operator>(const CTime &time) const;
virtual bool operator>=(const CTime &time) const;

virtual void print(ostream &sout) const;
virtual void input(istream &sin);

void setCurrentTime();

protected:
short mHour;
short mMinute;
short mSecond;

};

ostream& operator<<(ostream& sout, const CTime& time);
istream& operator>>(istream& sin, CTime& time);
}
namespace MRDateTime
{
static const unsigned int FIRSTYEAR = 1760;
static const CDay STARTDAY = TUESDAY;
static const unsigned int TOTALMONTHS = 12;
static const unsigned int TOTALWEEKDAYS = 7;
static const unsigned int TOTALYEARDAYS = 365;

class CDate: virtual public Comparable
{
public:
CDate(short dayOfMth = 1, CMonth month = JANUARY, short year = 1760);


virtual bool operator==(const CDate &date) const;
virtual bool operator!=(const CDate &date) const;
virtual bool operator<(const CDate &date) const;
virtual bool operator<=(const CDate &date) const;
virtual bool operator>(const CDate &date) const;
virtual bool operator>=(const CDate &date) const;

virtual void print(ostream& sout) const;
virtual void input(istream& sin);

static bool isLeapYear(unsigned int year);
static short daysInMth(CMonth &month, short year); //if february and leap year return 29
static string monthNames(short month);
static string dayNames(short day);

CDate yesterday();
CDate tomorrow();

void setCurrentDate();
unsigned int getYear() const {return mYear;};
short getDayOfMth() const {return mDayOfMth;};
CDay getDayOfWk() const {return mDayOfWk;};
CMonth getMonth() const {return mMonth;};
short getDayOfYear() const {return mDayOfYear;};

void setYear(int year) {mYear = year;};
void setDayOfMth(short day) {mDayOfMth = day;};
void setMonth(CMonth &month) {mMonth = month;};



protected:
unsigned int mYear;
short mDayOfMth;
CDay mDayOfWk;
CMonth mMonth;
short mDayOfYear;
private:
static short countLeaps(short year);

void setDayOfYear(short year, CMonth month, short dayOfMonth);
void setDayOfYear(short day) {mDayOfYear = day;};
void setDayOfWeek(short year);
void setDayOfWk(CDay &day) {mDayOfWk = day;};

};

ostream& operator<<(ostream& sout, const CDate& date);
istream& operator>>(istream& sin, CDate& date);
}
namespace MRDateTime
{

class CDateTime: public CDate, public CTime
{
public:
CDateTime() {setCurrentDate(); setCurrentTime();};
CDateTime(const CDate& date, const CTime& time)
:CDate(getDayOfMth(), getMonth(), getYear()), CTime(getHour(), getMinute(), getSecond()) {};
CDateTime(short dayOfMonth, CMonth month = JANUARY, short year= 0, short hour = 0, short minute = 0, short second = 0)
:CDate(dayOfMonth, month, year), CTime(hour, minute, second) {};


virtual void print(ostream& sout) const;
virtual void input(istream& sin);

virtual bool operator==(const CDateTime &dateTime) const;
virtual bool operator!=(const CDateTime &dateTime) const;
virtual bool operator<(const CDateTime &dateTime) const;
virtual bool operator<=(const CDateTime &dateTime) const;
virtual bool operator>(const CDateTime &dateTime) const;
virtual bool operator>=(const CDateTime &dateTime) const;


};

ostream& operator<<(ostream& sout, const CDateTime& dateTime);
istream& operator>>(istream& sin, CDateTime& dateTime);
}

[guestgulkan]

Because the functions you are providing in the CTime, CDate and CDateTime are not
correct virtual overrides.
The original virtual virtual functions in Comparable (such as virtual bool operator==(const Comparable &other)const = 0;) take a parameter of type Comparable.

The override which you provide in the CTime class for example, look like this virtual bool operator==(const CTime &time) const;

[makr28]

Thanks, I'll try to fix that with a cast or something

[makr28]

Can someone help me with a way to make this work? I can't figure it out

[guestgulkan]

As I said mate- Your virtual function overrides in the various derived classes are not correct!!